IOS 6的Xcode警告协议是没有意义的

Question

在PSPoemsViewController.h我有一个协议，声明如下：

@protocol PSPoemsViewControllerDelegate <NSObject> 

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 

@end 

，并在.m文件我有它的声明：

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 
{ 
... 
} 

在PSVersionViewController。 h I类有：

@interface PSVersionViewController : UIPageViewController <PSPoemsViewControllerDelegate, UIPageViewControllerDataSource> 

当我编译该编译器会引发警告：

/Users/Keith/Documents/My Projects/Poem Shed/Poem Shed/PSVersionViewController.m:28:17: Method 'savePoem:withText:' in protocol 'PSPoemsViewControllerDelegate' not implemented

事情是代码执行并找到应该丢失的方法。但是有一个奇怪的问题 - 即使没有中断设置，它有时会断开方法，然后崩溃。这暗示着某种腐败。我试过做一个干净的构建，删除方法并将其放回，但没有任何改变警告。我正在使用Xcode 6.1（它在测试版上也失败了）。

Answer 1

所以：

@protocol PSPoemsViewControllerDelegate <NSObject> 

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 

@end 

@interface PSPOemsViewController : UIViewController 

@property (weak) id < PSPoemsViewControllerDelegate> delegate; 

@end 

然后在PSPoemsViewController.m当你想调用这个方法调用：在符合该委托添加方法的类

//Check that the delegate is set and that it has implemented the method. 
if ([self.delegate respondsToSelector:@selector(savePoem:withText:)]) 
    [self.delegate savePoem:YOUR_POEM withText:@"]; 

然后。所以在你的PSVersionViewController。确保你也设置了委托。

PSPoemsViewController *anInstanceofPoemsViewController = ..... 
[anIntanceOfPoemsViewController setDelegate:self]; 

然后添加方法：

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 
{ 
... 
}